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Tue, 13 Oct 2026 14:13:07 -0700 Received: from nvidia.com (10.127.8.9) by mail.nvidia.com (10.129.68.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49 via Frontend Transport; Tue, 13 Oct 2026 14:13:05 -0700 Date: Tue, 13 Oct 2026 14:13:03 -0700 From: Nicolin Chen To: Samiullah Khawaja CC: David Woodhouse , Lu Baolu , Joerg Roedel , Will Deacon , Jason Gunthorpe , Robin Murphy , Kevin Tian , Alex Williamson , Shuah Khan , , , , Pratyush Yadav , Pasha Tatashin , "David Matlack" , Andrew Morton , Pranjal Shrivastava , Vipin Sharma Subject: Re: [PATCH v5 02/18] iommu: Implement IOMMU Live update FLB callbacks Message-ID: References: <20260921004834.2601285-1-skhawaja@google.com> <20260921004834.2601285-3-skhawaja@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0006C3DB:EE_|CH2PR12MB4182:EE_ X-MS-Office365-Filtering-Correlation-Id: 8a109ba4-476a-4ef1-9368-08df296ed89c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700016|23010399003|7416014|1800799024|82310400026|56012099006|11063799006|4143699003|22082099003|10067099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: XrM6IvCLkQUbA5Hu8GaaW3n0UFrfIxVB0mCTiuAlohiJ9jgJ7NnZK9T3Hr4gA3dHr5dgkieQ5GyZZIhQiI7u1gVyyZpyNhf0mwm3DYNYmEIWk7A1mlx+jUHyj64RIQ2B1zWfCwDF10b/Ajuz+oKCa0GDKs+ZV4oRrhQshukspDtKPjZXENvL2Dhei/5DsCZu2CYqPjIykHqSjofZ/0Pst9nM46/NhiEpzya2A6ZoC6BjWTA5xvFM8aIvWiTFTfOblU+GgVc2xmScdLeiVQYr7VFrdzBkUm9jo0RUERwbWGI1TUHwIO+U63ApA8kV/s3QjJne0Hu+0zdmOSjtOsINEgKK+W6bdEJuMntwGvTHvWeJ/N10IC8DbFV3fAZWNVSXIuQaERbPDW8xxkNVNJ0NUhADm6lAksH121e2to+CdHs05+Nf9ZG5Vl8v4pD1MMYG X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Oct 2026 21:13:36.5757 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8a109ba4-476a-4ef1-9368-08df296ed89c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0006C3DB.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4182 On Tue, Oct 13, 2026 at 08:57:05PM +0000, Samiullah Khawaja wrote: > On Mon, Oct 12, 2026 at 05:25:42PM -0700, Nicolin Chen wrote: > > Could incoming and outgoing objects exist in the same time? > > > > Correct me if I am wrong: I expect the lifecycle of an incoming > > object will end once liveupdate completes, and the outgoing one > > can only exist after that? > > LUO can have incoming and outgoing at the same time. The incoming FLB > stays until all the sessions from the previous kernel that use it are > finished, and the outgoing FLB is created when the first FD that uses it > is preserved in the current kernel. So if a new preservation starts > before all the incoming sessions are finished, both exist. > > Generally, it should be rare, as after the live update the userspace > orchestrator (like systemd) would probably finish all the sessions. At > the FD level it is mutually exclusive, but at the FLB level it is > possible. OK. It doesn't sound practically possible. Yet, fine if it's a common practice to have separate objs for LUO. Nicolin